US3846681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Velocity modulator device
Assignee: Bull SAS
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Filing: 1973-03-23
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Granted: 1974-11-05
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Expires: 1993-03-23
Abstract
Abstract A velocity modulator device is provided for printer type supports driven by rotary members comprising at least one driving mechanism including a motor causing a rotary member to rotate by means of a resilient torsion bar, said mechanism having a mechanical resonance frequency F. In accordance with the invention, the velocity modulator device is characterized in that the motor is a low inertia direct current motor supplied by a periodic current of the frequency F, the intensity of the current being such as to periodically bring the velocity of the rotary member to zero, at the frequency F, without changing its direction the motion of said member, resulting from superposition of a rotary uniform driving motion and an oscillatory motion at the frequency F.
Inventors
- 👤 R Arhan
- 👤 A Lacroix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:55
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/38
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
152 words
An intermittent motion system comprising, in combination: a rotatable assembly having at least one rotatable member to which intermittent motion is to be applied; a drive assembly for said rotatable device including a d.c. motor having a rotor of low inertia and a torsion bar connecting said rotor to said rotatable member, the system Consisting of said rotatable assembly and said drive assembly having a natural mechanical frequency F, said drive assembly including means for imparting a uniform rotational motion component of constant velocity V to said rotatable member and means for energizing said d.c. motor at said frequency F to impart an oscillatory motion component to said rotatable member having a velocity function equal to VM sin wt where VM is the maximum velocity of said oscillatory component and W 2 pi F; and control means for controlling energization of said drive assembly to assure VM is substantially equal to V.
Claim 2
Dependent Claim
152 words
An intermittent motion system comprising, in combination: a rotatable assembly having at least one rotatable member to which intermittent motion is to be applied; a drive assembly for said rotatable device including a d.c. motor having a rotor of low inertia and a torsion bar connecting said rotor to said rotatable member, the system Consisting of said rotatable assembly and said drive assembly having a natural mechanical frequency F, said drive assembly including means for imparting a uniform rotational motion component of constant velocity V to said rotatable member and means for energizing said d.c. motor at said frequency F to impart an oscillatory motion component to said rotatable member having a velocity function equal to VM sin wt where VM is the maximum velocity of said oscillatory component and W 2 pi F; and control means for controlling energization of said drive assembly to assure VM is substantially equal to V.
Claim 3
Dependent Claim
42 words
An intermittent motion system as defined in claim 1 wherein said control means includes means for producing an output signal indicative of VM and comparison means connected to said output signal for controlling energization of said d.c. motor such that V VM.
Claim 4
Dependent Claim
30 words
An intermittent motion system as defined in claim 2 wherein said means for imparting a uniform rotational motion component comprises a source of d.c. current connectd to said d.c. motor.
Claim 5
Dependent Claim
94 words
An intermittent motion system as defined in claim 3 wherein said rotatable assembly comprises a first pulley constituting said rotatable member, a second pulley coplanar with said first pulley an endless belt trained about said pulleys and bearing spaced printing elements thereon, a second torsion bar connected at one end to said second pulley and a rotor connected to the other end of said second torsion bar, said first and second torsion bars being similar and said rotor of the d.c. motor and said rotor connected to the second torsion bar having similar inertias.
Claim 6
Dependent Claim
38 words
An intermittent motion system as defined in claim 4 wherein said control means includes means for controlling the phase of said energization of the d.c. motor whereby said printing elements periodically come to rest at predetermined fixed points.
Claim 7
Dependent Claim
42 words
An intermittent motion system as defined in claim 2 wherein said control means also includes means for controlling the phase of said energization of the d.c. motor whereby to adjust the relative angular positions at which said rotatable member comes to rest.
Claim 8
Dependent Claim
22 words
The intermittent motion system as defined in claim 2 wherein said means for imparting uniform rotational motion comprises a second electrical motor.
Claim 9
Dependent Claim
19 words
The intermittent motion system as defined in claim 7 wherein said second motor is connected to said torsion bar.
Claim 10
Dependent Claim
23 words
The intermittent motion system as defined in claim 8 wherein said second motor is connected to the nodal point of said torsion bar.
Claim 11
Dependent Claim
81 words
The intermittent motion system as defined in claim 7 wherein said rotatable assembly comprises a first pulley constituting said rotatable member, a second pulley coplanar with said first pulley, an endless belt trained over said pulleys and bearing spaced printing elements, a second torsion bar connected at one end to said second pulley and a second rotor connected to the other end of said second torsion bar having an inertia substantially equal to that of said rotor of the d.c. motor.
Claim 12
Dependent Claim
20 words
The intermittent motion system as defined in claim 10 wherein said second rotor constitutes the rotor of said second motor.
Claim 13
Dependent Claim
43 words
The intermittent motion system as defined in claim 10 wherein said control means also includes means for producing an output signal proportional to V and comparison means connected to said output signal for controlling the amplitude of said energization of the d.c. motor.
Claim 14
Dependent Claim
21 words
The intermittent motion system as defined in claim 1 wherein said rotatable member is a type-carrying disc of a printing machine.
Claim 15
Dependent Claim
21 words
The intermittent motion system as defined in claim 1 wherein said rotatable member is a type-carrying drum of a printing machine.
Claim 16
Dependent Claim
22 words
The intermittent motion system as defined in claim 1 wherein said rotatable assembly includes an endless type-carrying band of a printing machine.
Claim 17
Dependent Claim
133 words
An impact printer system comprising a driven assembly including an endless band bearing spaced printing elements and a pair of driven pulleys around which said endless band is trained; a pair of similar torsion bars each connected at one end to a respective one of said pulleys; a pair of rotors having similar moments of inertia and each connected to the opposite end of a respective one of said torsion bars, means for rotating at least one of said torsion bars to impart thereto a uniform rotational movement component of constant velocity V; and means for rotating at least one of said torsion bars to impart thereto a sinusoidal rotational velocity component of frequency F corresponding substantially to velocity V ft. which corresponds to the natural mechanical frequency of the impact printer system.
Claim 18
Dependent Claim
133 words
An impact printer system comprising a driven assembly including an endless band bearing spaced printing elements and a pair of driven pulleys around which said endless band is trained; a pair of similar torsion bars each connected at one end to a respective one of said pulleys; a pair of rotors having similar moments of inertia and each connected to the opposite end of a respective one of said torsion bars, means for rotating at least one of said torsion bars to impart thereto a uniform rotational movement component of constant velocity V; and means for rotating at least one of said torsion bars to impart thereto a sinusoidal rotational velocity component of frequency F corresponding substantially to velocity V ft. which corresponds to the natural mechanical frequency of the impact printer system.
Claim 19
Dependent Claim
29 words
The impact printer system as defined in claim 16 wherein the means last mentioned imparts an oscillatory velocity function equal to V sin wt where W 2 pi F.
Claim 20
Dependent Claim
28 words
The impact printer system as defined in claim 17 wherein said last mentioned means comprises a d.c. motor having a rotor constituting one of said pair of rotors.
Claim 21
Dependent Claim
35 words
The impact printer system as defined in claim 18 including control means for controlling the amplitude and phase of said oscillatory component periodically to arrest the motion of said printing elements at predetermined fixed points.
Claim 22
Dependent Claim
26 words
The impact printer system as defined in claim 19 including a second electrical motor having a rotor constituting the other one of said pair of rotors.
Claim 23
Dependent Claim
31 words
The impact printer system as defined in claim 19 wherein said means for rotating to impart a uniform rotational component comprises a source of d.c. current connected to said d.c. motor.
Claim 24
Dependent Claim
39 words
The impact printer system as defined in claim 21 wherein said control system includes means for producing an output signal proportional to V and comparison means connected to said output signal for controlling the amplitude of said oscillatory component.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |